const findSmallestIndex = (arr) => {
  let smallestValue = arr[0];
  let smallestIndex = 0;

  for (let i = 1; i < arr.length; i++) {
    const candidate = arr[i];
    if (candidate < smallestValue) {
      smallestIndex = i;
      smallestValue = candidate
    }
  }

  return smallestIndex;
}

const selectionSort = (arr) => {
  const result = [];
  const copyArr = [...arr];

  for (let i = 0; i < arr.length; i++) {
    const smallestIndex = findSmallestIndex(copyArr);
    const smallestValue = copyArr.splice(smallestIndex, 1)[0];
    result.push(smallestValue);
  }

  return result;
}

const recursiveSelectionSort = array => {
  if (!array.length) return [];

  const copyArr = [...array];
  const smallestIndex = findSmallestIndex(copyArr);

  return [
    ...copyArr.splice(smallestIndex, 1),
    ...recursiveSelectionSort(copyArr),
  ];
};

const array = [2, 4, 5, 1, 6, 3];
const sorted = selectionSort(array);
const sorted2 = recursiveSelectionSort(array);

console.log('array', array);
console.log('sorted array', sorted);
console.log('recursive sorted array', sorted2);